quota: reorder flags in quota state

quota: reorder flags in quota state

Flags in struct quota_state keep flags for each quota type and
some common flags. This patch reorders typed flags:

Before:

0 USRQUOTA DQUOT_USAGE_ENABLED
1 USRQUOTA DQUOT_LIMITS_ENABLED
2 USRQUOTA DQUOT_SUSPENDED
3 GRPQUOTA DQUOT_USAGE_ENABLED
4 GRPQUOTA DQUOT_LIMITS_ENABLED
5 GRPQUOTA DQUOT_SUSPENDED
6          DQUOT_QUOTA_SYS_FILE
7          DQUOT_NEGATIVE_USAGE

After:

0 USRQUOTA DQUOT_USAGE_ENABLED
1 GRPQUOTA DQUOT_USAGE_ENABLED
2 USRQUOTA DQUOT_LIMITS_ENABLED
3 GRPQUOTA DQUOT_LIMITS_ENABLED
4 USRQUOTA DQUOT_SUSPENDED
5 GRPQUOTA DQUOT_SUSPENDED
6          DQUOT_QUOTA_SYS_FILE
7          DQUOT_NEGATIVE_USAGE

Now we can get bitmap of all enabled/suspended quota types without loop.
For example suspended: (flags / DQUOT_SUSPENDED) & ((1 << MAXQUOTAS) - 1).

add/remove: 0/1 grow/shrink: 3/11 up/down: 56/-215 (-159)
function                                     old     new   delta
__dquot_initialize                           423     447     +24
dquot_transfer                               181     197     +16
dquot_alloc_inode                            286     302     +16
dquot_reclaim_space_nodirty                  316     313      -3
dquot_claim_space_nodirty                    314     311      -3
dquot_resume                                 286     281      -5
dquot_free_inode                             332     324      -8
__dquot_alloc_space                          500     492      -8
dquot_disable                               1944    1929     -15
dquot_quota_enable                           252     236     -16
__dquot_free_space                           750     734     -16
dquot_writeback_dquots                       625     608     -17
__dquot_transfer                            1186    1154     -32
dquot_quota_sync                             299     261     -38
dquot_active.isra                             54       -     -54

Signed-off-by: Konstantin Khlebnikov <khlebnikov@yandex-team.ru>
Signed-off-by: Jan Kara <jack@suse.cz>